Improvement in low-water detectors for steam-generators



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e. B.. nasser,v or New YORK, N. Y.

Letters Patent No. 87,181, dated Feb'rfua/ry 23, 1869.

IMPROVEMENT IN LOW-WATER DETECTORS FOR .STEAM-GNERATORS.

The Schedule referred to in these Letters. Patent and making part of the same.

To all whom. 'it ina/y concern.

Beit known that I, G. BLMASSEY, of the city, county, and State. of New York, have invented la new and iin proved Low -Water Detector for Steam-Boilers; vand `I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming,l a part of this specification.

This invention relates to a new and improved lowwater detector for steam-boilers, and of that class in which the. expansion oi' metals is rendered subservient in operating the valve of the whistle or alarm at the proper time.

The invention consists in a novel construction and arrangement of parts, as hereinafter' fully shown and described, whereby -a very simple and eicient device for the purpose specified is obtained.

ln'the accompanying sheet'of drawings- Figure 1 is an elevation of my invention, partly in section.

Fgure 2, a horizontal section of the saine, taken in the line a: x, iig. 1.

Similar letters of reference indicate corresponding parts.

A represents a tube, of brass or other metal, which expands under the influence of heat, and is securely attached to the exterior of a steam-boiler, the lower part of the tube communicating.withA the boiler, by means of a pipe, B, at a point level with the low-water line, (See g. 1.)

On the upper end of the tube A, there is secured a steam-whistle, O, and p D is a valve, the seat of which is in the upper end of tube A, the stem E of said valve extending up through the whistle', and having, if necessary, a spring, a, applied to keep the valve Dclosed.

The lower part of the valve-stem has a screw-thread cnt upon it, and passes through a yoke, b, at the upper end of a-ferrule, c, which is secured on top of a wooden rod, F, the latter being within the tube A, and having its lower end screwed into a socket, d, at the lower end of A, as shown in tig. 1.

On the lower part of the valve-stem E, within the yokes b, there is placed a nut, e.

The operation is'as follows:

The steam-boileris supplied with the requisite amount of water, the ytrue or high-water line .being some dis- '.lhe tube A, from the heat oithe water within it,

will expand to a certain degree, and, when thus expanded, if the valve D is not sufficiently high to `close against its scat and preventthe passage of steam into the whistle, it is adjusted in a closed state by turning the valve-stein E', and the valve will remain closed so long as the tube is iilled with water, the pressure of the latter, in connectionwith the spring a, effecting that result.

When the water in the boiler descends, so that its surface will reach the level oi the pipe B, steam will rush up into A, and the water in A will descend to a level with .the water in the boiler. The heat of the steam being much greater than that of the wat-er which was previously in A, the latter will expand in a correspondingly greater' degree, but the wooden rod F will not-vary in length, as it does notexpand under heat, and this greater expansion of tube A will cause the seat -to be raised above the valve D, the latterbeingl kept stationary, owing to its connection with the nonexpansive rod F, and the steam will rush from A upward into the whistle, and-thealarm will be sounded.

Having thus described my invention,

. What I claim as new, and 'desire to secure by Let.-H

ters Patent, is-

The construction ofthe' low-water detector, consisting of the tube A, pipe B, rod F, ferrule C, yoke l), nut e, valve-rod E, and valve D, arranged, with vreference ato the boiler and whistle, substantially as described.

Witnesses G. B. MASSEY.

' 'FRANK Bnoonr.nv, 4 ALEX. F. ROBERTS. 

